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Fraser Cormack fa5bc9bba6 [RISCV] Optimize INSERT_VECTOR_ELT sequences 
This patch optimizes the codegen for INSERT_VECTOR_ELT in various ways.
Primarily, it removes the use of vslidedown during lowering, and the
vector element is inserted entirely using vslideup with a custom VL and
slide index.

Additionally, lowering of i64-element vectors on RV32 has been optimized
in several ways. When the 64-bit value to insert is the same as the
sign-extension of the lower 32-bits, the codegen can follow the regular
path. When this is not possible, a new sequence of two i32 vslide1up
instructions is used to get the vector element into a vector. This
sequence was suggested by @craig.topper. From there, the value is slid
into the final position for more consistent lowering across RV32 and
RV64.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D98250
2021-03-12 09:13:38 +00:00
benchmarks
bindings [Go] Fix bindings/go/llvm/IRBindings.cpp 2020-12-16 10:09:58 -08:00
cmake Revert "[cmake] Enable -Werror=return-type" 2021-03-10 14:47:08 -08:00
docs [ARM] Improve WLS lowering 2021-03-11 17:56:19 +00:00
examples Fix use of deprecated IRBuilder::CreateLoad in Kaleidoscope 2021-03-11 15:44:02 -08:00
include Revert "[OpenMP] Introduce the disable_selector_propagation variant selector trait" 2021-03-11 23:48:35 -06:00
lib [RISCV] Optimize INSERT_VECTOR_ELT sequences 2021-03-12 09:13:38 +00:00
projects llvmbuildectomy - replace llvm-build by plain cmake 2020-11-13 10:35:24 +01:00
resources
runtimes [PR48898][CMake] Support MinGW Toolchain tool sin llvm_ExternalProject_Add 2021-03-02 22:45:05 +01:00
test [RISCV] Optimize INSERT_VECTOR_ELT sequences 2021-03-12 09:13:38 +00:00
tools [Debugify][OriginalDIMode] Export the report into JSON file 2021-03-11 01:11:13 -08:00
unittests [FIX] Allow non-constant assume operand bundle operands. 2021-03-11 23:31:09 -06:00
utils [Utils] Check for more global information in update_test_checks 2021-03-11 23:31:16 -06:00
.clang-format
.clang-tidy - Update .clang-tidy to ignore parameters of main like functions for naming violations in clang and llvm directory 2020-01-31 16:49:45 +00:00
.gitattributes Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore [clangd] Store index in '.cache/clangd/index' instead of '.clangd/index' 2020-07-07 14:53:45 +02:00
CMakeLists.txt [cmake] Move check for libproc to config-ix.cmake 2021-02-18 10:54:27 +01:00
CODE_OWNERS.TXT [M68k][CODE_OWNERS](0/8) Add code owner for the M68k target 2021-03-08 12:30:56 -08:00
configure
CREDITS.TXT [NFC] Add contributors names to CREDITS.TXT 2020-10-07 13:22:55 -04:00
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
llvm.spec.in Update structured references to the license to the new license. 2019-01-19 11:30:51 +00:00
README.txt Test commit. 2020-03-14 18:08:26 -07:00
RELEASE_TESTERS.TXT Update the list of platforms & archs 2018-12-16 14:47:16 +00:00

README.txt 

The LLVM Compiler Infrastructure
================================

This directory and its subdirectories contain source code for LLVM,
a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you are writing a package for LLVM, see docs/Packaging.rst for our
suggestions.